when one channel is working alone all is well .but at times when using multiple class d channels whether in same enclosure or different casings with different power supplies;( by the way in all my amplifiers i was using smps)
and load is normal 4ohms or 8ohms also the signal was too low and no much power was being required from the amps . there will be a faint hissing sound , then bang
one channel has just failed but some times same setup and same amps. then the amps performs flawless and no issues very cold and load and circumstances are same as other times failed. .all cases were ucd or sigma voltages +/-55 and above. ir2110 versions and discreet versionsthe only multi channel class d which stood the test of time without issues was sigma delta hifi tlo74 classd 200watts . i did it with single power supply smps supplying 5 channels and dual power supply smps supplying 5 channels and it did not misbehave or fail for no reason like the above high voltage class d . maxx voltage i have ever used successfully on class d 200wt was +/-49volts.
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when one channel is working alone all is well .but at times when using multiple class d channels whether in same enclosure or different casings with different power supplies;( by the way in all my amplifiers i was using smps)
and load is normal 4ohms or 8ohms also the signal was too low and no much power was being required from the amps . there will be a faint hissing sound , then bang
the only multi channel class d which stood the test of time without issues was sigma delta hifi tlo74 classd 200watts . i did it with single power supply smps supplying 5 channels and dual power supply smps supplying 5 channels and it did not misbehave or fail for no reason like the above high voltage class d . maxx voltage i have ever used successfully on class d 200wt was +/-49volts.
I think for help you should provide schematics from failed amps
How about counterfeit semiconductor devices in your design ?
Are you shure you get true genuine parts ?
Often when amps fail in PRO design you have fakes
I had bad frustration experience 2012/2013
I have make UCD IR2110 / CD4049 in 2012/2013, amp fail, smell and I give up
.....June 2013 I travel Thailand for Holiday
and find in Bangkok Electronic City Banmore same circuit IR2110 CD4049 / CD4070 PCB assembled
I want to know it yet, have buy it and test later in Hotel appartment, everything work never fail with 90 V DC
Check fake components
when one channel is working alone all is well .but at times when using multiple class d channels whether in same enclosure or different casings with different power supplies;( by the way in all my amplifiers i was using smps)
and load is normal 4ohms or 8ohms also the signal was too low and no much power was being required from the amps . there will be a faint hissing sound , then bang
the only multi channel class d which stood the test of time without issues was sigma delta hifi tlo74 classd 200watts . i did it with single power supply smps supplying 5 channels and dual power supply smps supplying 5 channels and it did not misbehave or fail for no reason like the above high voltage class d . maxx voltage i have ever used successfully on class d 200wt was +/-49volts.
You need to synchronize the channels when it is self oscillating like I did in three level.
https://www.infineon.com/dgdl/Infin...N.pdf?fileId=5546d462533600a40153559b1bcc115c
regards
you must be German: Throttle=Drossel(klappe), but here you meant a choke (inductor)
Hello to all! Sorry for my English. The problem of connecting several class D amplifiers (UcD) to a single power source is solved simply, it is necessary to power each amplifier plus power and minus power through separate diodes (for example, MBR30200CT). Thus, I connected four channels from one source and everything works fine. Sincerely, Boris B.
The hissing sounds is not from interference each other channel but this is specific case for UcD. It is leaked PWM from backside and captured by op amp buffer circuit accumulated from leaked very high speed PWM become sound frequency area.
So by bypassing this leaked frequency will kill the hissing sound.
Multi class D
tested with 40vdc at 140 vdc ...... zero noise, no noise at startup, current limit and over temperature protected
tested with 40vdc at 140 vdc ...... zero noise, no noise at startup, current limit and over temperature protected
Attachments
Small Dclass
wow ,
which fets are you using ,and what ic is that driving those fets?
hi all what are the damping factors of these amps class d ?
although they are simple and effecient ,Are they better than class ab putting damping factor into consideration?
kindly help out
although they are simple and effecient ,Are they better than class ab putting damping factor into consideration?
kindly help out
Attachments
Fullbridge completed for subwoofer with protection dc /overcurrent
Good morning.
Can you send me the schematic for my e-mail?
luizcpimenta@gmail.com
Thank you.